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A140425 as a simple table

n a(n)
1 1
2 4
3 28
4 342
5 8170
6 388316
7 35871274
8 6434968504
9 2248575047080
10 1530856226085764
11 2029777404349820818
12 5241143888167535563974
13 26356732501074298121803368
14 258136468277025366420232101764

[1,4,28,342,8170,388316,35871274,6434968504,
 2248575047080,1530856226085764,
 2029777404349820818,5241143888167535563974,
 26356732501074298121803368,
 258136468277025366420232101764]

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Last modified October 16 14:09 EDT 2021. Contains 348042 sequences. (Running on oeis4.)